HP 750 - Manual (Page 162)

8-44 Troubleshooting C4705-90000
23. Mark Position
The purpose of this test is to verify that the mark encoder is detected.
Performthe mark position test as follows:
1 In the Service Tests submenu, scroll to 23 Mark Position" and press Enter.
SERVICE TESTS
23 Mark position
2 The Remove Media / Press Enter" message is displayed on the frontĆpanel. Remove the
media (if loaded) and press Enter to start the test.
3 The Looking for the Mark" message is displayed on the frontĆpanel while the plotter
searches for the mark encoder.
4 If the test passes, the Mark Found / Press Enter" message is displayed on the
frontĆpanel.
5 If the test fails, the Mark Not Found / Press Enter" message is displayed on the
frontĆpanel.
If the mark encoder fails the test, try one of the following:
1 Clean the mark encoder.
2 Perform the line sensor calibration ' page 7Ć5.
3 Perform the accuracy calibration ' page 7Ć6.